#ifndef _SYS_TIME_H#define _SYS_TIME_H #include <sys/types.h> struct timeval {	time_t		tv_sec;		// Seconds	suseconds_t	tv_usec;	// Microseconds}; struct itimerval {	struct timeval	it_interval;	// Timer interval	struct timeval	it_value;	// Current value};struct timezone; int gettimeofday(struct timeval *__restrict, struct timezone *__restrict); #endif	// _SYS_TIME_H